ChemIT notes on specific situations where we have noticed Outlook outperforming Mail.

Specific situations ChemIT strongly recommends using Microsoft Outlook on the Mac

You have a reasonable amount of email.

• Performance languishes with just several thousand email messages.
  • Behaviors: Slow, unresponsive, unreliable/ gets confused

You have administrator responsibilities

• Outlook's calendar integration is often beneficial.

You use a Cornell "special mailbox"

• Outlook handles it better than Mail does.